Turkish security researcher Ibrahim Balic says he reported a Developer Center security vulnerability hours before Apple shut down its developer Web site. The vulnerability enabled Balic to access the email addresses and real names (but not passwords) of more than 100,000 users. Balic told 9To5Mac that he promptly reported the vulnerability to Apple and plans to delete the information he collected. follow link
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Researcher May Have Caused Apple Developer Center Shutdown
I would say it was the vulnerability that "caused" the shutdown, not the researcher who reported discovering it.
Well, yes, though the vulnerability was there all along, and it was only his reporting of it that resulted in the shutdown. I was toying with "May Have Been Responsible for" but that felt worse in terms of what actually happened. We don't actually know that there was any causation at all, in fact, just correlation of his bug report and the site closing.